Estimates show that 50 to 75 percent of people with fibromyalgia suffer from irritable bowel syndrome (IBS). IBS is a chronic gastrointestinal condition characterized by cramps, abdominal pain, bloating, constipation, and diarrhea. No one knows exactly what causes IBS, but we do know it involves a malfunction of the large intestine. Nerves and muscles in the large intestine may contract too much or be overly sensitive to certain stimuli such as foods or stress. Other triggers include eating a large meal, menstruation, and sensitivities to certain foods and medication. As a result, stool may pass too quickly or slowly through the intestines, resulting in diarrhea or constipation. Sometimes, you may feel an overwhelming urge to have a bowel movement only to find that you can't.

IBS can be a major nuisance that disrupts everyday activities such as working, socializing with friends, and traveling. Albeit annoying, the condition does not cause permanent damage to the intestines and does not lead to serious diseases such as cancer.

Treating IBS often involves altering your diet to include more high-fiber foods, such as whole-grain pasta and breads. At the same time, you may need to cut back on fried foods, high-fat foods, coffee, caffeine, and alcohol. Certain sugars can trigger IBS in some people as well. In others, certain vegetables, such as broccoli, cabbage, and beans, may cause gassiness. Still others may need to avoid gluten, a chemical found in many grains. Keeping a food diary and recording your symptoms can help you pin down the foods that irritate you.

Taking steps to alleviate stress is almost always a part of treating IBS. Some people get relief with meditation, biofeedback, and hypnosis. In some cases, you may need to treat the symptoms. Some people treat constipation with laxatives, while those with loose stools may require antidiarrhea medications. All laxatives should be used only for the short-term since they can be habit-forming. Your doctor may prescribe a medication specifically approved for IBS if your symptoms are severe and don't respond to dietary changes and stress management. Psyllium and enteric-coated peppermint oil are often helpful, too. In some cases, an antidepressant can help. For more information about IBS, check out the Web site for the Irritable Bowel Syndrome Self-Help and Support Group, at www.ibsgroup.org.